A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using

The molar specific heats of an ideal gas at constant pressure and volume are denoted by C_p and C_v, respectively. If  $$\gamma $$ = $${{{C_p}} \over {{C_v}}}$$ and R is the universal gas constant, then C_v is equal to

A slab of stone of area 0.36 m² and thickness 0.1 m is exposed on the lower surface to steam at 100^oC. A block of ice at 0^oC rests on the upper surface of the slab. In one hour 4.8 kg of ice is melted. The thermal conductivity of slab is
(Given latent heat of fusion of ice = 3.36 $$ \times $$ 10⁵ J kg^$$-$$1)

If the radius of a star is R and it acts as a black body, what would be the temperature of the star, in which the rate of energy production is Q?